useUpdate

Register a callback function that will be invoked once per frame, whilst the game is not paused. It is responsible for updating some of the game state.

useUpdate(callback);

Examples

// Update the player's position, based on their velocity.
useUpdate((delta) => {
  pos.current[0] += velocity.current[0] * delta;
  pos.current[1] += velocity.current[1] * delta;
});

Using delta

In your update functions, it is important to think about when the delta value should be used. It is the number of milliseconds that have elapsed since the previous frame, so on higher framerate devices it will be a smaller number.

In the example above the player's velocity is being multiplied by delta to ensure that the player's movement is agnostic of the framerate. Otherwise, on higher framerate devices, the player should run faster and jump higher!